Abstract: An efficient and safe recovery of the remaining ore in the overlying bed formation by slope caving is an important issue faced by the mines in the transition from open-pit to underground mining. The practice shows that an integral large scale blasting of the remaining part of pit or the later period working pit enables an efficient and safe recovery of the remaining ore within the slope in the subsequent sublevel extraction and the formation of an adequately thick overlying bed. The practice in Baoguo Iron Mine is presented.

Key words: Remaining ore in slope, Blasting, Overlying bed, Remaining ore, Ore recovery